21/(x+2)+10/(x-2)=2,5
(31x-22)/(x^-4)-5/2=0
5x^-62x+24=0
(31+-29)/5
x1=2/5
x2=60/5
Ответ: 12 км/ч
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21/(x+2)+10/(x-2)=2,5
(31x-22)/(x^-4)-5/2=0
5x^-62x+24=0
(31+-29)/5
x1=2/5
x2=60/5
Ответ: 12 км/ч